fix: no false positives for plugins with index.js

[manniL]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Resolves #4713

Checklist:

• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-io]

Codecov Report

Merging #4714 into dev will decrease coverage by 0.02%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##              dev    #4714      +/-   ##
==========================================
- Coverage   90.45%   90.43%   -0.03%     
==========================================
  Files          67       67              
  Lines        2253     2258       +5     
  Branches      555      556       +1     
==========================================
+ Hits         2038     2042       +4     
- Misses        194      195       +1     
  Partials       21       21

Impacted Files	Coverage Δ
packages/builder/src/builder.js	93.53% <100%> (ø)	⬆️
packages/utils/src/resolve.js	94% <80%> (-1.56%)	⬇️

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